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temperature will be used to evaluate focused sources(such as infiltration from streamflow)and diffuse sources(such <br /> as infiltration of precipitation,and irrigation return)of ground-water recharge described by Izbicki and others <br /> (2002).Changes in ground water chemistry and the age of older ground water interpreted from carbon-14 data will <br /> be evaluated along selected flowpaths using the computer program NETPATH. <br /> Interim papers describing the source of high-chloride water to wells(FY06),and the movement,and age of water <br /> from wells(FY07)will be published as proceedings papers or journal articles during the course of the study.Annual <br /> progress meetings with cooperators and stakeholders will be held.A journal article integrating information from all <br /> aspects of the study including data review,well installation,data collection,telemetry,and 3-D visualization is <br /> planned at the end of the project in September 2008. <br /> STAFFING:The project chief will be John Izbicki in the San Diego office. Staff required to do this study is <br /> present in the San Diego and Sacrament Project Offices within California District.The project will require office <br /> personnel for acquisition,review,and entry of existing data into U.S.Geological Survey computer systems and for <br /> the development of a GIS.Field staff will be required for well installation and water-quality sample collection.A <br /> senior hydrologist will be required for visualization of results and a senior hydrologist/geochemist will be required <br /> for data interpretation and report preparation.Change in USGS Project Chief requires approval of both parties. <br />